Adjustable shaft for grindstones an d the like



(No Model.)

W. J ARNDT.

ADJUSTABLE SHAFT FOR GRINDSTONES AND THE LIKE.

No. 256,110. Patented Apr.11.1882.

Z11 Fig. "3

ATTORNEYS.

UNITED STATES PATENT Fries.

WILLIAM J. ARNDT, OF DETROIT, MICHIGAN.

ADJUSTABLE SHAFT FOR GRINDSTONES AND THE LIKE.

SPECIFICATION forming part of Letters Patent No. 256,110, dated April 11, 1882.

Application filed February 18, 1882.

To all whom it may concern:

Be it known that I, WILLIAM J. ARND'1,,of Detroit, in the county of \Vayne and State of Michigan, have invented certain newand useful Improvements in Grindstones; and I do hereby declare that the followingis a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same, reference being bad to the accompanying drawings, which form a part of this specification.

The object of this invention is to produce a simple, durable. and efficient shaft for grindstones and the like,by which they maybe readily adjusted on or removed from their shaft and others be substituted.

In the drawings, Figure l is a perspective view, Fig. 2 a vertical sectional view, Fig. 3 a transverse sectional view, and Fig. 4 a detail view, of the grindstone-shai't.

Referring by letter to the drawings, A designates the frame or housing, consisting of end pieces, B B, concaved bottom 0, adapted to hold water, and a bracket, D, under this bottom, provided with a set-screw, E, by which it may be adjustably secured to the edge of a table or bench, as shown in Fig. 1 of the drawlngs.

F designates the grindstone or emery-wheel, which is mounted on a shaft, G, journaled in suitable bearings in'the endsBB of housingA.

Upon the outer end of shaft G is keyed or otherwise secured a gear-wheel, H, adapted to be engaged by a gear-wheel, I, journaled on a stub-shaft, J, at the side of the frame, and provided with a handle or similar device, J, by which motion may be imparted to the grindstone. The gear or drive wheel I is secured on its shaft by means of a screw, K, entering the end of the latter, and having alarge thumbpiece or head, L, which overlaps the gearwheel.

(No model.)

The shaft G consists of two cylindrical sections, MN, formed square for a portion of their surface at their inner ends, as shown at M N. One of these sections, M, is provided with a central longitudinalopening, O,in which works a set or adjusting screw, P, the end of which is adapted to enter a corresponding screwthreaded recess, Q, in the end of the remaining section, N. It will thus be seen that by operating the set-screw P grindstones of different sizesmay be secured on or removed from the shaft, the screw P serving to hold the two sections of the shaft together when the grind-- stone is in position thereon.

As is obvious, by removing the screw K the gear-wheel I maybe removed from its shaft, and by disengaging the screw I? from the end of section N the two sections of the grindstoneshaft and the grindstone itself may be removed. The difterentparts of the device may thus be packed in a very small space for transportation from place to place, and may be readily adjusted together for operation when desired.

Having thus described my invention, I claim and desire to secure by Letters Patent of the United States I The shaft G,'consisting of two cylindrical sectionshaving square portions MN and iongitudinal openings or recesses Q Q, the latter of which is screw threaded, in combination with the set or adjusting screw I, working in the latter and serving to hold the two sections together, substantially as herein shown and specified.

In testimony that I claim the foregoing as my own I have hereto affixed my signature in presence of two witnesses.

IVILLIAM J. ARNDT.

Witnesses:

J 0s. M. WEISS, Rosa. A. LIeGE'rT. 

